[EXTREMELY IMPORTANT PATCH!!!]: To fix all maps and all fonts go to:
http://thepiratebay.se/torrent/4533019/Counter_Strike_Source_Mega_Fix_(Fonts_Maps)_(HalfLife2_Font_Fix)
[EDIT ] PLEASE APPLY THE FIX TO PLAY THE GAME! If you want to play an offline game, just make sure to play on the supported maps. If you get a run time error the map is BUGGED.
Well, here's the moment you've all been waiting for.
COUNTER STRIKE: SOURCE
A Cider Port for your Mac.
Just download, unzip, double-click, and play!
It works on most servers, some won't let you join. In some servers voice chat is enabled, in some it isn't.
The text is still garbled, so don't expect to be chatting up your frag buddies online, I say just find a server with voice chat working and stick to it.
Some games may require you to download additional files, just let them download or connect to another server.
This game will run on all Macs, running Mac OS 10.4.8 or higher.
...and yes, it runs on GMA950 integrated graphics.
Happy Fragging
Credits:
Mrberu
Xerxes9000sx
UPDATE:
HERE'S THE FIX TO PLAY THE GAME:
http://thepiratebay.se/torrent/4394071
Oh ye of a little faith! ^.^
[EDIT: To get the resolution to fit your screen, change the resolution settings to "widescreen" then pick the resolution of your choice (e.g. 1280x800 for Macbooks)]

TO MAKE IT WORK DELETE THE COUNTER STRIKE PREFERENCES PREFERENCES FOLDER (PATH: MACINTOSH HD -> LIBRARY -> PREFERENCES -> COUNTERSTRIKE PREFERENCES PREFERENCES) AND THEN ADD A NEW FOLDER WITH THE SAME EXACT ANME (Counter Strike Preferences Preferences)

Ok to get this working on Lion u need:
wineskin winery and this app
To get it to work:
1)download wineskin winery
2)download this torrent
3)right clck the app after downloading it and press show package contents
4)find the css folder and copy that to ur desktop
5)open wineskin winery and create a blank wrapper (u may have to download an engine first)
6)open the wrapper u just made and copy the css folder to drive_C
7)close the wrapper then re-open it and a screen will pop up and press advance then click at browse at where it says windows exe
8)navigate to the css exe and click choose
9)clos the app then relaunch
10)enjoy

This does not work anymore, and I would recommend against downloading it. I uploaded this a while back because, back in the day, this was the only simple method one could use to play CSS on OS X. That is not the case anymore, thanks to the advent of Steam for Mac. So, guys, come on... go support Valve, their version of the game runs better than mine.